The PMC Active twenty5.21i is a compact, stand-mounted loudspeaker that integrates PMC's Advanced Transmission Line (ATL) technology with active amplification, aiming to deliver high-fidelity sound in a streamlined package. This model is part of PMC's esteemed twenty5i series, known for its meticulous engineering and audio performance.
Design and Build
At first glance, the twenty5.21i maintains the distinctive aesthetic of the twenty5i series, featuring a sloped-back, rhomboid cabinet design. This shape is not merely for visual appeal; it serves to reduce internal standing waves, enhancing sound clarity. The cabinet measures 340mm in height, 162mm in width, and 284mm in depth, weighing approximately 6kg. Available finishes include Walnut, Oak, Diamond Black, and White Silk, all executed with impeccable craftsmanship.
Driver Configuration
The speaker employs a two-way driver system:
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Mid/Bass Driver: A 140mm long-throw g-weave™ cone housed in a cast alloy chassis, designed for accurate and dynamic low-frequency reproduction.
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Tweeter: A 19mm soft-dome unit developed in collaboration with SEAS, featuring a SONOMEX™ fabric dome and a 34mm surround with a dispersion grille. This design aims to provide wide dispersion and a natural high-frequency response.
Active Amplification and Connectivity
Each driver is directly powered by its own 100W Class AB amplifier, eliminating the need for external amplification and ensuring optimal driver control. The rear panel includes both balanced XLR and unbalanced RCA inputs, accommodating various source components. Notably, the metal plate housing the amplifiers functions as a heatsink and may become warm during operation.
Advanced Transmission Line (ATL) Technology
PMC's proprietary ATL design is a standout feature, utilizing a long, folded, and damped pathway within the cabinet to manage the rear energy from the bass driver. This approach enhances bass depth and clarity, allowing the compact twenty5.21i to deliver low frequencies that belie its size. The inclusion of the Laminair port further reduces turbulence, ensuring smooth airflow and improved bass precision.
Performance
The twenty5.21i excels in delivering a balanced and transparent sound profile. Its bass response is notably articulate and extends deeper than typical for speakers of its size, a testament to the effective implementation of ATL technology. Midrange reproduction is clear and natural, rendering vocals with lifelike presence. The high frequencies are detailed without being harsh, contributing to an overall engaging and fatigue-free listening experience.
The speaker's soundstage is expansive, offering precise imaging and a sense of depth that enhances the realism of recordings. Whether reproducing the intricate layers of a symphony or the intimate nuances of a solo performance, the twenty5.21i maintains composure and clarity.
Setup and Placement
While the twenty5.21i is relatively forgiving in terms of placement, optimal performance is achieved when mounted on sturdy stands and positioned with care. A slight toe-in towards the listening position can enhance imaging, and maintaining some distance from rear walls helps in achieving a balanced bass response. The speaker's design also allows for placement closer to side walls without significant compromise in sound quality.
Conclusion
The PMC Active twenty5.21i stands out as a meticulously engineered loudspeaker that combines the benefits of active amplification with innovative acoustic design. Its ability to deliver deep, articulate bass, clear midrange, and detailed highs from a compact enclosure makes it a compelling choice for discerning listeners seeking high-performance audio without the complexity of separate amplification components. While the investment is considerable, the twenty5.21i's performance and build quality justify its position in the premium segment of the market.